PROBLEM TO BE SOLVED: To provide a bed occupancy state detection method capable of determining that a subject is present on a get-on/get-off area at the peripheral edge part of a bed part and has placed feet on a bed installation surface.SOLUTION: The detection method includes: a load detection step S1 of detecting loads respectively applied to four end corner parts of the bed part 21 by four load detection means 2 a bed occupancy load storage step S10 of storing the total output of all the load detection means as bed occupancy loads when the centroid position of a subject H is within a bed occupancy area 23 at the center part of the bed part 21 a first determination step S30 of determining whether or not the centroid position is within the bed occupancy area 23 and a third determination step S36 of determining whether or not the present total output of all the load detection means is equal to or lower than a prescribed ratio to the bed occupancy loads when it is determined that the centroid position is not within the bed occupancy area 23. Then, when it is determined that the present total output is equal to or lower than the prescribed ratio, it is determined that the subject H is present on the peripheral edge part 22 of the bed part 21 and has placed feet on the bed installation surface 29.COPYRIGHT: (C)2012,JPO&INPIT【課題】被験者がベッド寝床部の周縁部の乗降領域上に存在してベッド設置面上に足を着けたことを判定できるベッドの在床状況検出方法を提供すること。【解決手段】検出方法は、ベッド寝床部21の4つの端角部にそれぞれ掛かる荷重を4個の荷重検出手段2により検出する荷重検出工程S1と、被験者Hの重心位置がベッド寝床部21の中央部の在床領域23内にある場合に、全荷重検出手段の合計出力を在床荷重として記憶する在床荷重記憶工程S10と、重心位置が在床領域23内にあるか否かを判定する第1判定工程S30と、重心位置が在床領域23内にないと判定された場合に、全荷重検出手段の現在の合計出力が在床荷重に対して所定の割合以下であるか否かを判定する第3判定工程S36と、を備える。そして、現在の合計出力が所定割合以下であると判定された場合に、被験者Hがベッド寝床部21の周縁部22上に存在してベッド設置面29上に足を着けたことを判定する。【選択図】図2
